Improvement in chronometer-escapements



H. 'ROTHFELDER.

Chronometer Escapement.

No. 48,726. Patented July 11, 1865.

PATENT OFFICE.

HENRY BOTHFELDER, OF NEW YORK, N. Y.

IMPROVEMENT IN CHRONOMETER-ESCAPEMENTS.

Specification forming part of Letters Patent No. 18,726, dated July 11, 1865.

To all whom it may concern Be it known that I, HENRY ROTHFELDER, of the city, county, and State of New York, have invented certain new and useful Improvements in Detached Escapements for Ghronometers; and I hereby declare that the following is a full, clear, and exact description of the same, reference beinghad to the accompanying drawings, in which- Figure 1 represents a top view of my improvements Fig. 2, a side view of the same. Fig. 3 are detached views of parts forming the locking lever or detent.

Similar letters of reference indicate corresponding parts in the several figures.

The nature of my said invention consists in a locking-lever formed with a jointed springarm, acted upon by the pallet or change-pin of the balance to move the said lever, and the disengaging-detent,thatallows thescape-wheel to move and give an impulse to the balance by acting upon the notched roller or pallet of the balance. 5

To enable others skilled in the art to make and use myinvention, I will proceed to describe its construction and operation.

A represents the scape-wheel, which is of ordinary eonstruction,with undercut teeth 1 2 3 4 5.

B is the mainpallet or scape-roller, fixed to the arbor of the balance and provided with the ordinary notch 0, against the side of which the teeth 1 2 3 4 of the scape-wheel A strike as they pass it.

D is the ordinary lifting-pallet or charge-pin, fixed to the scape-roller B, for the purpose of disengaging the detent-pin E of the lockinglever F from the teeth of the scape-wheel A. This locking-lever F has its center of motion G, and has one arm, H, extending toward the scape-wheel and scape-roller and carrying the detent-pin E, and another arm, H, extending in opposite direction and terminating with counterbalance-head I. To the end of thelockin g-lever F is attached a three-armed lever, J, the central arm, K, of the same being pointed, and extending nearly at right angles to the locking-lever F and tangentially toward the balance-arbor.

M is a coiled spring attached to the lockinglever F and taking hold ofthe arm N of the lever J, and thereby keeping the end of the arm 0 against the side of the locking-lever F, in a manner that when the lifting-pallet D presses against the upper side of the arm K of the lever J toward the scape-wheel A the arm K will yield and allow the lifting-pallet to pass by without disturbing the locking-lever F, but when the lifting-pallet is moving in opposite direction, and from the scape-wheel A, it will strike against the end of the arm K and will move the locking'lever F off from it until the said lifting-pallet is allowed to pass by.

P is a coiled spring, pressing the lockinglever F toward the scape-wheel against the stop-pin Q.

The operation, in which these parts act upon one another, is as follows: The locking-lever F being at rest against the stop Q, the tooth 4 of the scape-wheel resting against the detent-pin E, the balance, however, being in-motion in the direction shown byarrow l, the lifting-pallet D, acting against the end of the arm K of the lever J, moving the locking-lever F, and thus its detent-pin E, off from the tooth 4 and liberating the scape-wheel A, the tooth l of the same falling in with the side of the notch G of the main pallet and giving an impulse to the balance. Before the tooth 1 escapes from the notch O of the main pallet the liftingpallet D had passed the point of the leverJ and the locking-lever F is again at rest, so that when the tooth l escapes the notch O of the main pallet the scape-wheel is locked again by the tooth 3 falling upon the detentpin E.

From the foregoing it will be seen that by this construction and arrangement of the locking-lever and lifting-pallet the friction resulting from forcing off the point of the lever J to allow the lifting-pallet to pass by is greatly reduced, and the action of the locking-lever against the lifting-pallet is controlled to a great precision, and it is evident that in the practical manufacture of this escapement men who are less competent can produce a more accurate time-keeper than they can with those escapements hitherto known or used.

I do not claim the roller or pallet B, changepin D, notch O, or scape-wheel A, as these are The arm J, jointed to the lever F and prosubstantially the same as have been employed. vided with a spring, as set forth in combina- Neither do I claim acting upon the detent or tion with the change-pin D, detent E, and esescapement by the change-pin D. Neither do cnpement, as specified.

I claim a lever for'an escapement yielding in HENRY ROTHFELDER. one direction and rigid in the other; but Witnesses:

What I claim, and desire to secure by Let- R. BOEKLEN,

ters Patent, is ANDREWS. TODD. 

